How do I install the Test Modernizer skill?

Run npx skillmds@latest add jlreyes/test-modernizer in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Test Modernizer safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Test Modernizer?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Test Modernizer free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Test Modernizer?

jlreyes (@jlreyes) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Test Modernizer by jlreyes — Agent Skill

Name: Test Modernizer
Author: jlreyes

Test Modernizer

Apple's guide for modernizing test suites: migrating XCTest to Swift Testing and restructuring existing Swift Testing tests around newer features. Use when asked to modernize, migrate, or convert tests; not for writing brand-new tests, running tests, or XCUI automation (which cannot migrate). (Content extracted from your local Xcode on install.)

jlreyes 5ffb42e 1.5 KB Updated Sep 17, 2026

File contents

test-modernizer (stub)

Not yet extracted. This is a stub. The real skill is Apple-authored content that ships inside Xcode; Apple's license doesn't permit redistributing it, so this kit extracts it from YOUR Xcode instead.

To install the real content (requires Xcode 27+, ~5 seconds), run the extraction script that ships alongside these skills. Relative to this skill's own directory it is at:
../apple-api-updates/scripts/extract-apple-skills.sh
(In the Claude Code plugin layout it is also exposed at the plugin root as scripts/extract-apple-skills.sh. If apple-api-updates is not installed alongside, install it — the script ships inside it.)

If you are an agent reading this: resolve this SKILL.md's path and run that script with your shell tool. Skill bodies are cached for the session and you cannot run /reload-plugins yourself (it's a user command), so after extracting: answer the current request by reading the extracted SKILL.md and its references/ directly from disk (plain markdown, fully usable), and ask the user to run /reload-plugins — or start a new session — so future invocations serve the real content.

Frequently asked questions